DocumentCode :
3179104
Title :
Wideband focusing using spatial-delay filters for direction-finding
Author :
Sivanand, S.
Author_Institution :
Dept. of Electr. Eng. North Carolina Univ., Charlotte, NC, USA
fYear :
1993
fDate :
4-7 Apr 1993
Firstpage :
0.666666666666667
Abstract :
For wideband direction-finding related to wideband-source location estimation, the coherent signal-subspace method has been found to be more effective than the incoherent or frequency binwise processing method, and to achieve lower detection and resolution thresholds. The method involves a preprocessing step of focusing signal spaces at different frequencies to a common frequency, and a narrowband direction-finding algorithm following the preprocessor. For uniform linear arrays focusing corresponds to spatial delay implementation. In the present work, least squared error and maximally, flat FIR (finite impulse response) filters for realizing the spatial delay are designed. Simplified implementations that reduce computational complexity are also proposed. The effectiveness of these filters is confirmed by computer-simulation experiments
Keywords :
FIR filters; array signal processing; delay circuits; filtering theory; least squares approximations; FIR filters; coherent signal-subspace method; computational complexity; computer-simulation experiments; detection threshold; finite impulse response; least squared error; maximally flat filters; narrowband direction-finding algorithm; preprocessing; resolution thresholds; signal spaces; spatial delay; spatial-delay filters; uniform linear arrays; wideband direction-finding; wideband focusing; wideband-source location estimation; Computer errors; Delay; Finite impulse response filter; Frequency estimation; Narrowband; Navigation; Signal processing; Signal resolution; Spatial resolution; Wideband;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Southeastcon '93, Proceedings., IEEE
Conference_Location :
Charlotte, NC
Print_ISBN :
0-7803-1257-0
Type :
conf
DOI :
10.1109/SECON.1993.465697
Filename :
465697
Link To Document :
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